On Thu, 5 Sep 2019, Josh Poimboeuf wrote:

quoted

All the indirect jumps are turned into alternatives when retpolines 
are in place.

Actually in C code those are done by the compiler as calls/jumps to
__x86_indirect_thunk_*.

Sure, and the thunks do the redirection via JMP_NOSPEC / CALL_NOSPEC, 
which has alternative in it.

-- 
Jiri Kosina
SUSE Labs